Door knob



FIG. 1 is a side perspective view of a door knob according to my new design.

FIG. 2 is an enlarged front view thereof.

FIG. 3 is an enlarged back view thereof.

FIG. 4 is an enlarged top view thereof.

FIG. 5 is an enlarged bottom view thereof.

FIG. 6 is a reduced end view thereof; and,

FIG. 7 is a reduced opposite end view thereof. 

The ornamental design for a door knob, as shown and described. 